Walkthrough with Evernote (video)

Annoted forms
neu.annotate
Good Reader
iAnnotate

Google Forms

Frank Buck's instructions
http://frankbuck.blogspot.com/2011/07/conducting-classroom-walkthrough-using.html

Other observation apps:
eCove (free)
Stride
Observation 360


__IEP checklist__ Free - A great tool to have at your fingertips when you need to track IEP goals for your students. It allows you to input relevant data so you can keep track of your student’s goals.

Portical
http://www.portical.org/tools/gf/#obs

iPad Tools for School Leaders
http://www.lengel.net/ipad/